<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    @media screen and (min-width:1024px) {
        body {
            background-color: red;
        }
    }

    @media screen and (min-width:768px) and (max-width:1024px) {
        body {
            background-color: blue;
        }
    }

    @media screen and (max-width:768px) {
        body {
            background-color: green;
        }
    }
</style>

<body>
    媒体查询
</body>

</html>